pip3 install -r requirements.txt -i https://www.piwheels.org/simple
install cv2 from here: https://www.pyimagesearch.com/2016/04/18/install-guide-raspberry-pi-3-raspbian-jessie-opencv-3/
pip3 install -r requirements.txt -i https://www.piwheels.org/simple
install cv2 from here: https://www.pyimagesearch.com/2016/04/18/install-guide-raspberry-pi-3-raspbian-jessie-opencv-3/